Abstract
This paper studies the behavior of lattice girder composite slabs with monolithic joint under bending. A full-scale experiment is performed to investigate the overall bending resistance, deflection and the final crack distribution of latticed girder composite slab under uniformly distributed load. A finite element model is given for the analysis of the latticed girder composite slabs. The effectiveness and correctness of the numerical simulations are verified against experimental results. The experimental and numerical studies conclude that the lattice girder composite slabs conform to the requirement of existing design codes. A parametric study is provided to investigate the effects of lattice girder with following conclusions: (a) the lattice girder significantly increases the stiffness of the slab when comparing with the precast slab without reinforcement crossing the interface; (b) the additional reinforcement near the joint slightly increases the stiffness and resistance, while it prevents damage near the joint.
Highlights
IntroductionAmong various types of components in the precast concrete structures, slabs are suitable and achievable for precasting since the loads on slabs are usually uniform and their shapes are regular
In order to investigate the strain condition of different components in the latticed girder composite slab (LGCS), electrical resistance (ER) strain gauges are bonded to the longitudinal reinforcement and Method the concrete surface of the slab
It is found that a region of additional reinforcement near the joint has smaller stress value when comparing with the additional reinforcement near the joint has smaller stress value when comparing with the neighboring region
Summary
Among various types of components in the precast concrete structures, slabs are suitable and achievable for precasting since the loads on slabs are usually uniform and their shapes are regular. Precast and composite slabs have been used for concrete structures for more than 200 million m2 in China, 2018. It is predicted that in the coming 5 years, the usage of precast slabs will expand to 2 billion m2 in China, which will bring about CNY 600 billion to the construction market. According to the construction demands and economic considerations, it is of great interest in studying the experiments and numerical simulations of the precast concrete slabs. One of the most widely used precast floors is the latticed girder composite slab (LGCS)
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